List remove x not in list while trying to make pokemon game

Question

尽管该行现在是多余的，但是在运行几个迭代之后，应该从原始列表中删除self.y的行会引发“Valueerror:列表.删除（x） x不在列表中。我现在不知道我做错了什么。在

from random import sample, choice


class Selection(object):


    def __init__(self):

        self.pokemon_list = [
            'Blastoise', 'Charizard', 'Venasaur',   
            'Artiquno', 'Moltress', 'Zapdos', 
        ]

        self.x = sample(self.pokemon_list, 3)

        print """
    CONGRATULATIONS TRAINER, YOU HAVE BEEN GIVEN %s,
    YOUR JOURNEY BEGINS NOW! PROCEED WISELY OR DIE.
    """ % (self.x)


    def gary_pok(self):

        for self.z in self.x:

            if self.z == "Blastoise":
                self.y = 'Venasaur'
                **self.pokemon_list.remove(self.y)
                print self.pokemon_list**
            elif self.z == "Charizard":
                self.y = 'Blastoise'
                print self.pokemon_list.remove(self.y)
            elif self.z == "Venasaur":
                self.y = 'Charizard'
                print self.pokemon_list.remove(self.y)
            else:
                self.y = choice(self.pokemon_list)
                print self.pokemon_list.remove(self.y)

        print "Gary's pokemons:{}, Nidoqueen and Archanine.".format(self.y)

bah = Selection()
bah.gary_pok()      

Answer 1

循环时，无法从列表中删除项。 因为，当循环第一次发生时，它将从您的列表中移除项，当循环进行第二次迭代时，它希望移除已经移除的项。在

在打印Artiquioni之后，Charizard被删除，然后在下一次迭代中，Charizard不在列表中